Shaping mechanism



Feb. 14, 1928.

J. GOULDBQURN ET AL SHAPING MEHANIsM Filed Deo. l. 1921 3 Sheets-Sheet 1 J. GOULDBOURN ET Al.

SHAPING MECHANISM Filed 1921 5 Sheets-Sheet 2 Fig. 2.

Feb. 14,'1928.

1,658,841 J. GOULDBOURN ET AL SHAPING MECHANISM Filed Dec. l. 1921 5 Sheds-Sheet 3 Fig. 3.

Patented Feb. 14, 1928.

`i UNITED i STATES PATENT OFFICE. y. f

JosErr eonminounNY AND EEGrNALD EoYD wooDCocK, oELEICEs'rEE, ENGLAND, AssIGNoEs To UNITED SHOE MACHINEEY CORPORATION, or rA'rEnsoN, NEW JEE- i n SEY, A CORPORATION O1? NEW JERSEY.

sHArrNe MEcHANIsM. f

Application filed December 1, 1921, Serial No. 519,`131,`an.d in Great Britain December 2, 1920.

This inventionrelates-to shaping mecha msm and is vherein illustrated as embodied in a machine designed l`orgrinding heel trimming machine blades to a predetermined form. i.

The blades of heel trimming machines of the type described inthe specilication of United States Letters Patent No. 543,349, grantedk July 23, 1895,011 application of Oscar L, Noble, are curved both lengthwise and laterally and are held in a cutter head by arcuate tongues on the head engaging corresponding` grooves formed at each side I olf the blades, such tongues being eccentric to the vaxis of rotation of the head. These blades do not usually vary in longitudinal curvature and the grooves of all the blades areV of the same` curvature. For ditlerent ranges of work, however, the lateral curvature and the width of the blade, or either alone, may vary. It is important in such a curately machine that the various blades shall be acground to the form of edge desired to secure the proper shaped heel andto secure the desired anglebetween the ground tace and the outer' tace of each blade. Heret-oiiore, it has been customary to grind these blades to the form desired merely by the presentation of the blades held by the operator to la. grinding wheel.

y ln view of the foregoing an object of the present invention is to provide a machine by the use of which the accurate grinding ot. blades such as'the cutter bladesof heel trimming machines may be facilitated.

ln accordance with this object, as herein illustrated, a blade holder is mounted to move across the peripheral edge of an abrading element and'also to rock rtoward and from the abrading element, a templet is provided for .controlling the rocking movement y*of the blade holder, and :provision is made for vadjusting bodily the .position ot theI templet to compensate for reductio'u'in the diameter oit theabrading element as Vit operation which comprises pivotally mount ingy a blade holder in such a manner that the axis of pivot of the blade holder liesat the center of curvature of a supported blade, providing means for swinging the blade holder about its axis to feed ay supported blade inthe direction of its length, and iniparting` traversing movement to the blade holder orcau'singan abrading element to act along the edge ol the supported blades.

As the grinding wheel wears away,the aspect of the blade holder with relation to the wheel will change in the absence of a'correct.- mg means. As another feature of the invention, there is provided improved mechanism for insuring the proper presentation of the .blades to the grinding wheel in spite of a reduction in the diameter of the wheel. As shown, a blade holder. and a grinding kwheel truingtool are providedwithmechanism for varying conjointly their operative positions with respect to the grinding wheel whereby the aspect of these members is maintained unchanged as the wheel vwears away. Y These and other features ol the invention willV appeal' from a consideration or f the following specication and accompanying drawings in which: y ,f Fig; 1 is an enlargedsideelevation of the machine; Figli?, is a View of the machine shown in Fig. 1in front elevation, Fig. 3 is a` side elevation in section having certain parts broken away they more clearly to show the mounting ofthe truing tool and workv carrier, i v

Fig. 4 isa longitudinal view jin section showing in detail a portion of the mechanism used in reversing the 'direction of travel of the work carriage, l

and vmore particularly :the arrangement of construe.-

the spacer lever. i

cured kto the head i2.

gears.

ln the illustrated embodiment of the inventiona base or standard 14 has suitably secured at its upper extremity a bracket l2 formed With a plurality of bearing arms l0, l which rotatably support the shaft' of a grinding Wheel S. Power is supplied to the machine generally through a belt i5 adapted to ybe interchangeably lei'igaged with the tight and loose pulleys l5, i8 mounted on a horizontal pulley shaft- .in the base frame 14. rl`he grinding `wheel shaft is driven from the pulley shaft 2O by a means of a belt 24 ruiming over apulley 22 fixed to shaft 20 and over a pulley 26 fixed to grinding Wheel shaft. For the purpose of grinc ing cutters fr In a hce trimming machine a. second grinding wheel 28 may be mounted on the extremity 'of the grinding` Wheel shaft opposite the wheel 8.

The blades to be sharpened are arried by n'ieeha'nisni which. traverses the 'periphery of the grinding vneel 8; This mechanism includes a centrally bored or hollow shaft 3G which is slidable in beari 3l, mounted on the frame i4. Fixed in the ore at one end of `this shaft is a nut (Figs. 2 and 4) engageable vvitha Worin or screw held against axial displacement by means ofbearlngs Bti, 36 formed on a bracket 3S se- TWo continuously driven, beveled gears 40, 42 are vfixed against endivise movement on a smooth cylindrical extension of the Worm or screw but are free to rotate thereon, being driven by a beveled gear 44 (Fig. l) securedto the upper end of an inclined shaft 46 journaled in a portion #of the bracket 38. rlhis shaft 46 is driven through .bevel gears 48, 50 from the horizontal shaft20. To clutch the bevel gears 40, 42alternately to the Worm screw, adoubleclutch vcollar 52 is splined to the extension of the Worin or screw and is provided with clutch teeth at both sides to engage cooperating teethformed on the bevel The clutch collar 52'is moved in eitherdirection by a clutch shifting arm '54, one end of which enters a groove in the collar and the other end of which loosely surrounds a cam rod 7G to bc referred to later.

F rom so much of the description as has already been given it will be understood that the bevel gears 40 and 42 are rotated in opposite directions upon the extension of the shaft 34 by means of the gear 44 (Fig. l). It therefore follows that if the clutchshift- .ing arm 54 is moved either to the right or kto the left, as viewed 1n Fig. 2, causing the clutch ycollar to engage one orthe other of the oppositely rotating gears 40, 42, the Worm or screwshaft 66 (upon Which the clutch collar is splined)y will rotate in uni- .son with either of the gears 40, 42 engaged by the clutch collar. This provision of means-to rotate the 'Worm 34 in opposite netas/ii directions (Figs. 2 and 4) Will, by the ai'd of the nut 32, effect movement of the hollow shaft 30 to the right or left of the position shown in Fig. 2, thereby causing the shaft to traverse the periphery of the grinding iviieel. As will hereinafter be more fully explained, the equipment which holds the blades during the grinding operation is mounted upon the rod 80, so it Will be recognized that the rotation of the worm shaft 34 in opposite directions effects not only traverses of the hollow shaft across the grinding element 8 but also traverses of the Work carrier, or blade holder, which is mounted upon the shaft 30.

@n this blade holding mechanism Which is arranged to traverse'the grinding wheel, is a pair of stops and (i2 (Figs. 2, 3 and 4) Which, as Will be described, are adjustable in accordance with the Widths of the blat to bc ground and determine, by their positions, the times at which the direction of traverse shall change. The stops, at the end of each traversing movement, engage a stud 64 (Figs. 2 and 4) Vwhich yprojects radially from a long slide rod 6G Which extends loosely through the hollovx7 shaft 30, through the Worm 34, and through a bearing extension (Figs. 2 and 6) of the bracket 38. The rod 6() is actuated by the stops when' a blade has completed its traverse of the Wheel and, through mechanismto be described, slides the clutch collar 52 alternately into engagement With the clutch teeth on the bevel gears 40, 42. Secured to the rod 66 are two collars 7() and 72 (Fig. 6) which cause the actuation of an arm 74 straddiing the rod and fixed on a cam rod 7 6 which rod is slidable in the bearing extension G8 and in lugs on the bracket 88 (F 2). Fixed to the cam rod T6 are two collars 78 and 80, bet-Ween which and the clutch shifting arm 54 are interposed two coiled springs which are alternately compressed and extended by movement of the rod 76. For holding the clutch collar in engagement with one or the other of the bevel gears 40 or 42, tivo pawls 86, 8S are pivoted on horizontal pins on lugs of the bracket 38. The paWls have hooked ends which are also beveled for a purpose which will appear. For disengaging the hooked ends of the paivls from the arm 54 alternately, during reciprocation of the mechanisnnrcam surfaces 90 and 92 are formed on the cam rod and engage cooperating cam surfaces 94, 96 on the paWls. A certain amount of losty motion between the cam surfaces allows end- Wise movement of the cam rod 76 and a consequent oompression of one of the springs 82 or 84 and the extension of the. other spring before the cam surfaces engage.

Turning now to the operation of the mechanism for reversing the direction of travel of the blade carrier across the peripheral lil (Fig. 2.)

face of the grinding wheel, and assuming thatV the blade holder is moving tothe right and that the hooked end of the pawl 86 is hooked over the arm 54 to hold the clutch collar in engagement with the bevel gear 40, assoon as the stop 60, which corresponds to the left hand edge of a blade in the holder, engages moves the rod 66 and'cam rod 76 to the right) the spring 82 will be compressed and the spring 84eirtended till the cam surface 90 engages its cooperating surface 94 and thereby raises the hooked end ofthe pawl 86 from behind the clutch shifting arm 54. The compression of the spring 82 thereupon 'liorces the clutch shifting arm -54 to the right till the hook on the pawl 88 engages behind ythe arm and thereby puts and keeps the clutch collar 52 inengagement with the opposite bevel gear 42 to change the direetien of traverse to the left. Y Movement of the blade holder to the left ultimately causes the stop 62 to engage the stud 64, and the movement of the slide rod 66 and cam rod T0 tothe leit, trips the pawl 88 in a similar way and causes the pawl. 86 again to lock the clutch collar 52 inengagement with the bevel pinion 40, thus causing another tra-- verse of the mechanism to the right. The arm 54 is enabled to lift the hooked pawls by reason ot its .engagement with the beveled ends ol the hooks.

Since the blades are curved longitudinally and lie directly infront of the grinding` wheel, it is desirable, when inserting or removing the blades, to have the holder moved away from the grinder. VThis may be conveniently accomplished by giving the blade Y holder an extra traversing movement in one he spacer lever direction at the completion of the grinding action. Near one end of the 'rod G6 is a spacer in the form of a leverr having a handle 100 and an upwardly facing fork 98 adapted to embrace the rod 66 and being iii- -terposed between the collar V70 and that end ot'ithe arm 74 vwhich straddles lthe rod (36. may be rocked about the axis or' the cam rod 76 to depress the fork 9S by means of a cam lever pivoted at 108 to the arm 7 4 and having on one arm a iinger piece 104 and on the other arm a cam surface 106 arranged to engage the upper surface of the spacer. When the spacer Yfork isdepressed, it will be clear that an extra travel of the' blade holder to the right is allowed by reason of the fact that the col,- lar T 0 must travel an additional distance, equal tothe thickness of the spacer, lbefore Y it engages the arm 74 and actuates the clutch shitting mech anism. in this manner permits the work carrier to move tree and clearer the main part oi the grinding machine preparatory to the removal or insertion of blades. p y

:To insure that the .blade traversing mechthe stud 64 (and hence upwardly extending Mounting the spacerV ment 148 (Fig. 1),y engaged bya sei-ewv a hook 114-arranged to .engage the ,clutch f shiftingv arm 54 toV prevent its movement beyond av central position. The other arm r 112 of this lever is reduced at one endk and passes through an enlarged opening 118 in the spacer'. A spring 116 connected tothe bracket and to the arni y112 tends to raise the hook into engagement with the arm This tendency is resisted when the spacer is in its normal raised position by the contact of the arm 112 with the bottoni et theopening 11S.V As soon as the spacer is lowered, however, theV movement of the` bottoni of opening 11S allows the reduced end of the arm 112 to be lowered, and consequently thel hook 114 will rise intoithe path or the arm 54 to prevent its movement beyond a neutralposition. Thus the blade traversin g mechanism is stopped Vpositively when the extrak traverse is completed and the blades are ready for removal. As will be later described, the blade holder is also given an abnormal rocking finovement atfthis time to facilitate removalot the blades,

The blade holder, which is mounted (by means of bearings121, 123) to slide with n the hollow shaft 30 and to rock thereon, comprises a blade holder carriage 120 having arms 122 and 124, to the upper ends of which is pivoted a yoke shaped frame 126 adapted to receive and support the curved blades 128 and 130. The blades are clamped between a centraliblock 132 fixed to the lrame 126 and the end clamps '134 and 13G, each clamping member having curved tongues or ridgesV ii) adapted to'eiigage in corresponding grooves on the blades. A hand wheel 138 formed on one end of a right and left screw rod 140, 142 may be actuated to cause the yend clamps 134 and 136 to approach one anotheiito exert` clamping action' upon the blades. Since the blades may diiier slightly in` width, a lost motioncoi'inection in the forni of a pin and slot is formed between theY screw rod and the central block'132. As shown, screw rod into which projects a pin146 on end clamps to compensate1 for the slight dit ferences which may exist in the. widthso'l2v there is a cut-out portion 144 in the the blades. For ieedingthe bladesr towards an arc about their they blade holder is a toothed segs sliat't the grinding wheel in centers of curvature,` provided at one fend with stant as the blade is ground or worn down,

thereby providing a substantially uniform bevel on the blade edges irrespectiveotI the amount oit' wear.A rlilie end clamps 1341 and 136 have arcuate ribs 151i engagingl in grooves on the stops G and'52 .so that the stops will remain in tl eir adjusted position notwithstanding various angular adjustments ot' die clamps relatively to the trame 126. lifhen the end clamps are moved, the` position et' the stops 60, G2 are changed lonf gitudinally'ot the blade holder Carriage an amount depending on the width oi" the blades. Thus the widths of the dades determine the extent ot reciprocation ot the blade holder.

llt has been hereinbefore pointed out that the blade holder is mounted to rock about vthe shaft 30 and to the end et eiiectin'g and controlling this rocking movement the carrier 120 provided with a downwardly extending` arm 160 1). fit lower end, this arm carries a roller or templet 'follower 162 on a stud. 1G11 which stud extends substantially radially of the giindii'ig wheel S, the arm 160 being of sucli'length that the follower 162 is spaced substaiitiallytlie same distance from the shaft 30 asthe-pivots 'et' the blade holder. A templet 106 having a surface contour corresponding to the shape it is desired to be imparted to the blade or blades to be sharpened has. atoney end, a downwardly extending positioning 4lange 16S (Fig. 2) to engage'the side ot a table or templet support 172 termed on a normally tixed traine. Dowel pins 170 extending ifroiii this table also aid in locating the teinplet accurately by engagement in corresponding peifoiatioiis in the templet. The teniplet rigidly secured in position by means ot a )air ot hoolied arms 17d tied together by a rod 176 and pivoted to eccentric pins lSprojecting troni a shalt 180 jou'rnaled in extensions ot the table'12. )Whenever the hook-s are swung up over the templet, they may be drawn downwardly to clamp the ten'iplet against the table by means oi. the handle 182 secured to the shaft 180. Tonia-intein the teinplet and tollowerin cooperative engagement with each other during their relative traverse, a spring-pressed plunger 184 located in the arm 160 carries at its lower end a roller 186 riding on a'tracl;

k188 which is straight throughout vthe greater portionoi' its length and paialle'llto the hollow shaft 30. llear one end of thetracl,

' 'however,it is cut away or inclined, as'at 190. to allow an abnormal rockingrm'ovement of the blade holder whenever the ylatter has made its extra travel tothe right, as above described. This permits anextra movement of the blade holder radiallyaway from. the wheel as well as axially beyond it to facilitate the removal or insertion ot blades.

As the grinding wheel wears away7 the angular relation of the blade clamping mechanism relatively to the wheel would change were it not ior the provision oi? a compensating device. To this end, `and asl shown, there is swiugingly mounted on the hollow shaft 30 a frame 192, normally fixed, and carrying the teuipletsupporting table 172. Likewise mounted to swing on the hollow shaft, is a vsecond fraiiie'19l(l4`igs. 1, 2 and 3) carrying a grinding wheel truing tool 200. The frame 19% is formed near one end with an arcuatefplate G (Fig. arranged substantially radially with respect to the wheel and engaged by a similarly formed plate 198 which comprises thetruing tool holder. ne truing'tool 200 is mounted on a Ytorlred stud extending from the holder 108 and may be traversed across the wheel by sliding the holder along the arcuate plate 105. The truing tool frame 19a and the templet supporting frame 192 are simultaneously ladjusted about their common axis by a right and left screw-threaded shaft 202 (F ig. 1) threaded in rookable studs 20st mounted in arms o't the frames 192 and 1941. The screw is held against endwise movement by a fixed collar 20G interposed between the forks .ot a plunger 208 slidable in a iiXed bearing 210 on'tlie base frame la.

rlhe blades, when introduced between the yclamping members 132 aiidll, 136, abut at their ends remote from their cutting edges on fixed stops on the blade holder. The construction is such that the blades. however Ymuch worn, can be adjusted about their centers of curvatureyby means ot the i'iiiental rack 14:8, to bring the blade to the riding wheel without ifarying the angle oil presentation ot the blade to the grinder. 'llie length of the upwardly extending' arms 122 and 1211 of the bladeliolder carriage is chosen to be just suilieient tomove the mean Ypoint of the average blade .likely'to bevniet with, in a line so'iie'arly straight and radial orp the grinding wheel as'to allow'ot'the reduction of the diameter ot' the wheel by as much as some L10% without materially atlecting the angle of presentation of the blade to the inding wheel. Evidently the variations in the position ot the worl holder due to the irregular surface contour ot the templet will, at different points of 'the ground face of any blade, vary the angle last mentioned but the saine templet will produce invariably the same result on a similar blade however little or the blade remains and however much the grinding wheel is worn within the limit indicated. `The distance of the operllU movement (towards ating point of oi? the hollow shaft is substantially equal to the distance between the axis of the hollow shaft and the point chosen as the operating point on the grinding wheel for blade grinding', and the arms and le'lt screw 202 `threaded being equal in length, the following cooperative Ladjustments between the parts to be mentioned will result. Asthe grinding wheel is worn away the operative, by means oi' the hand wheel attached to the rod 202, advances the truing tool 200 towards the grinding wheel a distance equal to the amount worn away. `Since the screws carried by the rod 202 are oppositely threaded., rotation of the rod will cause the arms 192, 19a to approach or recede from one another and in the event the truing tool is moved ltowards the grinding wheel the telnplet carrying arm 192 will accordingly move away 'from the lined pivot 206 a like distance. This movement of the templet away from the grinder allows the arm 160 carrying the roll 162 to swing outwardly and thereby rocks the blade carrier about the rod 30 towards the asmuch as the lengths of the arms 192, 191i are equal, the templet will move outwardly the same distance the truing wheel moves inwardly. Finally since'the arm 160 is Vof such length that the iollowerl62 is spaced substantially the same distance Yfrom `the shaft 30 as the pivots of the blade holder, it will be seen that outward movement of the `templet permits a like outward movement of the arm 160 and a corresponding inward the grinding wheel) o'l the blade carrier. Adjustment of the-truing tool 200 towards or away from the grinding wheel S causes a corresponding` and equal adjustment ot the blade holder towards or away from the grinding wheel.

Having thus described our iurei'xtion, what weclaim as new and desire to secure by `llietters Patent of the United States, is

l. ln an abrading machine, an abrading element, a shaft, a blade holder mounted on said shaft, means to reciprocate the 'blade holder across the tace of the abrading element, means ior rocking the blade holder about said shalt towards and away Jrom the abrading element, a truing tool for the abrading element mounted to rock on said shaft, and means for rocking said blade holder and truing tool through substantially equal distances to insure the proper relation of the holder to the abrading element Vas the truing tool from theaXis i through which the right grinding wheel. ln`

r for causing the .diameter of the abrading element is reduced.

2. In anabrading machine, an abrading element, a blade holder, a truing tool, a `trame supporting the truing tool Jfor swinging movement towards the abrading element, a frame supportingthe blade hol-dcr Afor swinging movement towards the abrading element,v rocking studsk carried vby the trame, a sliding fork, and a screw threaded in said studs and held against axial inovement by said fork for swinging said trames simultaneously with the wear rof said abra-d-V ing element. e i

3.' ln an abrading machine, an abrading element, a slidable shaft, a blade yholder mounted to rock upon saidv shaft tovari'ls and away from the abrading element and to slide with said shatt'in a direction parallel to the axis oit the alirading element, a trame mounted uponv said sha-tt for supporting a templet and a roller connected to the blade holder and adapted to cooperate with the 'templet, means Yfor sliding and rocking the holder, and means'or adjusting the templet supporting-'trame to allow for reduction in the .diameter of the abrading element.

4l. In an abrading machine, an abrading element, a blade holder mounted to slide and rock relatively to said abradi-ng element, a .7

frame, means for sliding the blade holder, a templet and cooperating follower interposedbetween said trame and blade lholder sliding movement, a track on' said frame, a spring pressed roller interposed between said blade holder tain the templet and follower in contact, and an inclined portion on said track to allow said follower and templet toseparate upon abnormal sliding movement of said lirlade` holder. v n

5. ln a `machine ttor grinding curved blades, an abrading tool, a work carriage, arms extending from the carriage, a blade holder pivoted to thearms, the pivotal axis of the blade holder lying at the center ofi curvature of the blades, means for swinging;

theblade holder about said axis to feed a blade in the direction of its length towards the abrading tool, yand traversing mecha` nism for causing the abrading tool toact along' the edge of the blade.

In testimony whereof we have signed our names to this specication.

JOSEPH VGrOULDB@URN REGINALD BOYD VVOODCOGK.

the holder to rock during its and said track to mainv llll 

